One website I often go to is Thinkinfinity, or http://www.thinkfinity.org.

This website is run by Verizon as a free resource to educators, parents and students. Here, you can search a variety of educational websites (i.e. NCTM, NCTS, NCTE, Illuminations, and a variety of other websites that you'd typically have to pay to have access to) for lessons, videos and interactivities. You can search by general keywords, or you can search by your specific state standards.

There are also opportunities for free PD, as you can sign up for a variety of webinars (past, present and future), and often watch them right then and there. You can print out certificates from it afterwards.

It's a great site that I can't say enough about; best thing to do is just go try it out!

~Marissa